ULTRAFINE PARTICLES POINT TO INADEQUATE CONTAINER STORAGE P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #7 Background At a 900-student school, students and staff complained daily of burning eyes, nausea and headaches. Administrators were especially concerned about the continual stream of these indoor air quality-related complaints, because the 10-year-old, three-story school was carefully maintained. In addition, the complaints were limited to individuals using the basement floor. To address these concerns, administrators evaluated the building’s indoor environment and found that it met existing standards. However, this evaluation did nothing to solve the problem.” Problem Assessment After this conventional approach failed to identify the cause of the co

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